I can give you a little detail on the 78. My kitchen scales put it at 5 1/4 oz. Your blade and handle lengths sound right. As to the thickness it is near dead on 1" at it's thickest point, this might be slightly misleading due to the contoured scales but it is still a hand filler. Even closer to the OHT would be the 178 as it has the combo edge but I'm not a fan personally. Not much of what you want to know but I hope it helps.
I just poked around on the Wenger NA site and used to comparison feature on this page http://www.wengerna.com/contentmgr/showdetails.php?id=1258&show=allThe answer is, no, there's isn't one like the 60, 78 and 75 which has a pocket clip as well. The closest one is the 61 which is almost identical to the 60 but has a corkscrew instead of the Phillips.I will also be very interested in one of those new Rangers if it's possible to get a pocket clip on it. Let me know how your scale swap turns out.
Can't say I'm a fan of what I have seen either.